220042021 has 4 divisors (see below), whose sum is σ = 231623200. Its totient is φ = 208460844.

The previous prime is 220042019. The next prime is 220042037. The reversal of 220042021 is 120240022.

220042021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220042021 - 2¹ = 220042019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220041992 and 220042010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220042001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5790561 + ... + 5790598.

It is an arithmetic number, because the mean of its divisors is an integer number (57905800).

Almost surely, 2^220042021 is an apocalyptic number.

It is an amenable number.

220042021 is a deficient number, since it is larger than the sum of its proper divisors (11581179).

220042021 is a wasteful number, since it uses less digits than its factorization.

220042021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11581178.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 220042021 is about 14833.8134341780. The cubic root of 220042021 is about 603.7195065093.

Adding to 220042021 its reverse (120240022), we get a palindrome (340282043).

It can be divided in two parts, 22004 and 2021, that added together give a square (24025 = 155²).

The spelling of 220042021 in words is "two hundred twenty million, forty-two thousand, twenty-one".